I'm looking to start the potty with DD and I'm wondering if I need both a potty seat and the toilet trainer seat that fits on top of the toilet? We only have 1 upstairs bathroom so Im wondering if I should get a potty for downstairs and the toilet topper seat for upstairs? Thanks mamas!

I don't have any experience with the baby bjorn toilet topper, but their "Little Potty" is wonderful. And at about $13, it's a small investment to save you from running frantically up the stairs 20 times a day!